| Calculating streamfunction from wind components [message #83239] |
Thu, 14 February 2013 09:22  |
Sir Loin Steak
Messages: 42
Registered: January 2012
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Does anyone know if there are any IDL routines that can calculate the horizontal streamfunction from given zonal and meridional wind components? I have searched online and on this forum, and am surprised I can't find anything.
I could probably write my own, but it would make my life easier if there was already one available!
Thanks,
Liam
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| Re: Calculating streamfunction from wind components [message #84256 is a reply to message #83239] |
Fri, 10 May 2013 09:32  |
Kenneth Bowman
Messages: 86
Registered: November 2006
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On 2013-05-09 20:40:32 +0000, james.rachelanne@googlemail.com said:
> Hi Liam,
>
> I'm looking to do something similar. Did you ever find anything useful?
>
> Cheers,
>
> Rachel
Is the flow 2-D and incompressible so that
u = - d psi/dy
and
v = d(psi)/dx ?
Depending on your boundary condtions, you may be able to integrate
across the domain in one direction or the other to get a streamfunction.
Otherwise you have to solve the elliptic problem for psi. There is a
table of cases (2-D, 3-D, irrotational, etc.) in Dutton's book on
atmospheric dynamics.
You can calculate streamlines (which are equivalent to the
streamfunction in special cases) using a trajectory model (which is, in
general, a non-trivial undertaking).
Ken Bowman
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| Re: Calculating streamfunction from wind components [message #84536 is a reply to message #84256] |
Mon, 20 May 2013 03:08 |
james.rachelanne
Messages: 2
Registered: May 2013
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Junior Member |
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Hi Ken,
Sorry for the delayed response I only just noticed your reply. Thanks for the tips. Fortunately I have now found another way of investigating the problem without calculating streamfunction. I will certainly bear this advice in mind if I do need to compute it later, although I think it would be a challenge as I don't have much background in fluid dynamics, so I would still be interested to know if anyone finds any IDL code for a horizontal grid, or any code at all for a vertical cross section.
Many thanks,
Rachel
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